I love the look of the clarion, both the juvie and adult and dont think there is truly an ugly angelfish with the exception of the "old woman". I have been in the hobby long enough to remember when a clarion could be had in So Cal for just around $100, but that was in 1970's dollars. I remember the ones I saw were very aggressive, quite like a passer, but very pretty.
They look pretty good under reef lighting. Too bad that few can afford a steady diet of coral if you do put them in a reef... and even fewer have reef lighting on a FOWLR.
I had one in college that was traded in to our shop after I ordered it for a guy for his 200 - it was about $175 IIRC and the guy took it home in the shipping bag. It was a puppy dog type of fish like a passer in a different costume. I had 10Ks and URI Actinics back in that day and the orange and blues were really nice. I truly regret selling it when I moved back home, along with a blue ribbon eel that ate krill and formula 1 frozen food (it was traded in too and I have no idea how the guy got it to eat).
So little margin that it may very well become ill-advised to go after rare fish in the future.